STOCK PLANS AND SHARE-BASED COMPENSATION (Performance-based Awards and Restricted Stock Units) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Performance Based Awards (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value of awards released		$ 3,200,000
Number of performance-based awards shares released as percentage of target number, minimum	0.00%
Number of performance-based awards shares released as percentage of target number, maximum	200.00%
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2015	0
Granted, shares	50,000
Vested, shares	0
Change in units due to performance achievement for PSUs vested in the year, shares	0
Forfeited or expired, shares	0
Outstanding, shares, at March 31, 2015	50,000
Outstanding and expected to vest at March 31, 2015	30,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2015	$ 0.00
Granted, weighted-average grant date fair value per share	$ 53.74	$ 58.55
Vested, weighted-average grant date fair value per share	$ 0.00
Change in units due to performance achievement for PSUs vested in the year per share	$ 0.00
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00
Outstanding, weighted-average grant date fair value per share, at March 31, 2015	$ 53.74
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	9 months
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	9 months
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2015	2,614,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2015	1,569,000
Long-Term Performance-based Awards (PRSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance-based awards shares released as percentage of target number, minimum	0.00%
Number of performance-based awards shares released as percentage of target number, maximum	200.00%
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2015	61,000
Granted, shares	65,000
Vested, shares	0
Forfeited or expired, shares	0
Outstanding, shares, at March 31, 2015	126,000
Outstanding and expected to vest at March 31, 2015	102,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2015	$ 55.51
Granted, weighted-average grant date fair value per share	$ 52.80	$ 57.76
Vested, weighted-average grant date fair value per share	$ 0.00
Forfeited or expired, weighted-average grant date fair value per share	$ 0.00
Outstanding, weighted-average grant date fair value per share, at March 31, 2015	$ 54.12
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	2 years 3 months 3 days
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	2 years 3 months
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2015	6,546,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2015	5,305,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Grant date fair value of awards released	2,700,000	1,600,000
Reduction in number of shares available for issuance under the 2007 Plan per award granted	2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, shares, at January 1, 2015	692,000
Granted, shares	104,000
Vested, shares	(64,000)
Forfeited or expired, shares	(3,000)
Outstanding, shares, at March 31, 2015	729,000
Outstanding and expected to vest at March 31, 2015	682,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Outstanding, weighted-average grant date fair value per share, at January 1, 2015	$ 43.86
Granted, weighted-average grant date fair value per share	$ 52.25	$ 57.05
Vested, weighted-average grant date fair value per share	$ 42.70
Forfeited or expired, weighted-average grant date fair value per share	$ 41.23
Outstanding, weighted-average grant date fair value per share, at March 31, 2015	$ 45.16
Weighted Average Remaining Contractual Term [Abstract]
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	1 year 5 months 12 days
Outstanding and expected to vest, weighted-average remaining contractual term, at March 31, 2015 (in years)	1 year 3 months 3 days
Aggregate Intrinsic Value [Abstract]
Outstanding, aggregate intrinsic value, at March 31, 2015	37,987,000
Outstanding and expected to vest, aggregate intrinsic value, at March 31, 2015	$ 35,544,000